Title :
Improved strategy of time-frequency opportunistic spectral usage for multi-rate wireless systems
Author :
Yubo Wang ; Chenggui Wang ; Chao Li ; Ducheng Wu
Author_Institution :
Coll. of Commun. Eng., PLA Univ. of Sci. & Technol., Nanjing, China
Abstract :
In this paper, we present an improved strategy of channel probing and transmission scheduling in a multi-rate wireless system. We consider a fixed data time model, where time is slotted and channel states do not change within one slot. In a multichannel wireless system, a transmitter can opportunistically use channels with high-quality conditions. In order to make better decisions and find out the channel with the maximum transmission rate, the transmitter should probe individual channels by sending control packets, which will consume time and energy, thus reduce effective time for actual data transmission. In fact, the coherence time of the channel may be much larger than the duration of one slot. We can send multiple back-to-back packets if the channel are always in good conditions. Leveraging the absorbing Markov chain model, we propose a strategy for opportunistic spectral usage, in which both time and frequency domain process are taken into account.
Keywords :
Markov processes; radiocommunication; scheduling; time-frequency analysis; Markov chain model; actual data transmission; back-to-back packets; channel coherence time; channel probing; control packets; effective time reduction; fixed data time model; high-quality conditions; maximum transmission rate; multichannel wireless system; multirate wireless systems; opportunistic spectral usage; probe individual channels; time-frequency domain process; time-frequency opportunistic spectral usage; transmission scheduling; Fading; Markov processes; Monitoring; Signal to noise ratio; Throughput; Transmitters; Wireless communication;
Conference_Titel :
Information Science and Technology (ICIST), 2013 International Conference on
Conference_Location :
Yangzhou
Print_ISBN :
978-1-4673-5137-9
DOI :
10.1109/ICIST.2013.6747825